Larvel render 500 page instaed welcome view

I create new laravel project using laravel new and did composer updadte , host the site in localhost. but renders 500 page instead of welcome screen. I also change the function in route to this

**Route::get('/', function () {
    return "hello world";
});**

this is in web.php not showing this even. thanks please help me

via Chebli Mohamed